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ksmbd: make __dir_empty() compatible with POSIX

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commit ca4974ca95 upstream.

Some file systems may not provide dot (.) and dot-dot (..) as they are
optional in POSIX. ksmbd can misjudge emptiness of a directory in those
file systems, since it assumes there are always at least two entries:
dot and dot-dot.
Just don't count dot and dot-dot.

Cc: stable@vger.kernel.org # v6.1+
Signed-off-by: Hobin Woo <hobin.woo@samsung.com>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hobin Woo 2024-09-04 13:36:35 +09:00 committed by Greg Kroah-Hartman
parent ef83620438
commit 3c1fd66a19
1 changed files with 4 additions and 3 deletions
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7
fs/smb/server/vfs.c
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@ -1110,9 +1110,10 @@ static bool __dir_empty(struct dir_context *ctx, const char *name, int namlen,
struct ksmbd_readdir_data *buf;
buf = container_of(ctx, struct ksmbd_readdir_data, ctx);
buf->dirent_count++;
if (!is_dot_dotdot(name, namlen))
buf->dirent_count++;
return buf->dirent_count <= 2;
return !buf->dirent_count;
}
/**
@ -1132,7 +1133,7 @@ int ksmbd_vfs_empty_dir(struct ksmbd_file *fp)
readdir_data.dirent_count = 0;
err = iterate_dir(fp->filp, &readdir_data.ctx);
if (readdir_data.dirent_count > 2)
if (readdir_data.dirent_count)
err = -ENOTEMPTY;
else
err = 0;